Article
Physics, Multidisciplinary
Hongzheng Zhao, Johannes Knolle, Roderich Moessner, Florian Mintert
Summary: By studying a family of structured random drives, we have discovered that particle excitation to high energy states can still be well controlled even in non-high frequency driving regimes, allowing the observation of drive-induced phenomena in a long-lived prethermal regime in the lowest band.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Devendra Singh Bhakuni, Lea F. Santos, Yevgeny Bar Lev
Summary: A mechanism to suppress heating in periodically driven many-body quantum systems is proposed, utilizing long-range interactions and relevant initial conditions. Decreasing the driving frequency can reduce heating and entanglement buildup in these systems. This mechanism is robust to local perturbations and can be generalized to higher dimensions.
Article
Physics, Multidisciplinary
Takashi Mori
Summary: This work provides a simple formula for the heating rate under fast and strong periodic driving in classical and quantum many-body systems. The formula is based on constructing a time-dependent dressed Hamiltonian by moving to a rotating frame and using a truncation of the high-frequency expansion of the micromotion operator combined with linear-response theory. The accuracy of the formula is confirmed for specific classical and quantum models, showing that the second-order truncation of the high-frequency expansion yields quantitatively accurate heating rates beyond the linear-response regime. Our result suggests that the heating dynamics can be encoded in the first few terms of the high-frequency expansion, despite the asymptotically divergent behavior often associated with heating.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Shengnan Feng, Yu Ju, Rentong Duan, Zaiqin Man, Shuyi Li, Fengrui Hu, Chunfeng Zhang, Shuxia Tao, Weihua Zhang, Min Xiao, Xiaoyong Wang
Summary: Periodic heating of CsPbBr1.2I1.8 nanocrystals can completely suppress the phase-segregation effect under strong light illumination.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Shuangyuan Ni, Taotao Hu, Hang Ren, Kang Xue, Jiali Zhang, Xiaodan Li, Shuang Lu, Xiaoxuan Gu
Summary: We studied the many-body localization property in the Heisenberg Ising Chain model with periodic driving using matrix exact diagonalization. The driving protocol involved periodic switching of the system's Hamiltonian between two operators. By observing the excited state fidelity, we found that under small disorder strength, the system transitions from an ergodic phase to a localized phase with periodic driving, while under large disorder strength, the transition occurs from a localized phase to an ergodic phase. We also discovered a critical driving period that triggers the phase transition, which decreases with increasing driving strength.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Guo Xuan Chan, J. P. Kestner, Xin Wang
Summary: Theoretically, a range of nearly sweet spots appears in the coupled singlet-triplet qubit system when a strong enough external magnetic field is applied. Ramping to and from the judiciously chosen nearly sweet spot using sequences based on the shortcut to adiabaticity offers maximal gate fidelities under charge noise and phonon-induced decoherence, facilitating realization of high-fidelity two-qubit gates in singlet-triplet qubit systems.
Article
Optics
Takumi Mikawa, Ryusei Okaniwa, Yuichiro Matsuzaki, Norio Tokuda, Junko Ishi-Hayase
Summary: In this study, the ESDR spectra under strong RF fields were theoretically and experimentally analyzed using Floquet theory. The results revealed that anticrossing structures appearing under strong RF fields were induced by the generation of RF-dressed states due to two-RF-photon resonances. Additionally, it was found that unintentional DC bias magnetic fields parallel to the NV axis allowed for 2n-RF-photon resonances. These findings have implications for precise MHz-range AC magnetometry and Floquet engineering in open quantum systems.
Article
Materials Science, Multidisciplinary
Hongzheng Zhao, Florian Mintert, Johannes Knolle, Roderich Moessner
Summary: This letter investigates the localization phenomenon in quantum systems under aperiodic drives. By identifying a hidden conservation law in a disordered spin chain, the authors find that the system can still exhibit localization even under aperiodic drives. Interestingly, the introduction of additional potential disorder leads to delocalization of the system, resulting in a controllable parametrically long-lived prethermal regime. This study provides an example of persistent single-particle localization without eigenstates.
Article
Physics, Applied
Anton Gregefalk, Erik Sjoqvist
Summary: Spin echo technique can be used to refocus random dynamical phases and retain the purity of quantum spins. High-speed execution of all elements of a spin echo sequence can be achieved using transitionless quantum driving. This technique has applications in nuclear magnetic resonance and quantum information processing.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
W. I. L. Lawrie, M. Rimbach-Russ, F. van Riggelen, N. W. Hendrickx, S. L. de Snoo, A. Sammak, G. Scappucci, J. Helsen, M. Veldhorst
Summary: As quantum processors scale up, the accurate characterization of errors due to crosstalks between qubits is important. This study presents a novel benchmarking protocol to analyze single-gate fidelities in a 2x2 hole spin qubit array in germanium. The results show high gate fidelities and robustness to crosstalk errors, providing crucial information for scaling up quantum information technology.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Constantine Shkedrov, Meny Menashes, Gal Ness, Anastasiya Vainbaum, Ehud Altman, Yoav Sagi
Summary: Ultracold atomic gas is a useful tool for studying many-body physics. Floquet engineering, a recent addition to the experimental toolbox, creates effective potentials through periodic modulation of the Hamiltonian. However, external modulations can lead to energy absorption and heating in many-body systems. This study shows that Floquet engineering can be applied to a strongly interacting fermionic gas without inducing excessive heating. The results provide insight into the behavior of driven many-body systems and have potential implications for exploring exotic phases of strongly interacting fermions.
Article
Physics, Multidisciplinary
Li-Na Luan, Mei-Yu Zhang, L. C. Wang
Summary: In this study, Floquet dynamical quantum phase transitions (DQPTs) of the XY spin chain in transverse fields under periodic quenching were investigated. The properties of Floquet DQPTs resulting from two-stage periodic quench with different time scales were analyzed using the return amplitude, corresponding rate function, and geometric phase. Different time distributions for each quenching period were discussed, which determined the emergence of Fisher zeros.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Sthitadhi Roy, Roderich Moessner, Achilleas Lazarides
Summary: This study investigates the effect of periodic driving on Anderson localization on random trees, revealing that the introduction of an extra dimension leads to a competition between localization and delocalization, resulting in a regime of re-entrant localization in the phase diagram.
Article
Quantum Science & Technology
Jonas Glatthard, Luis A. Correa
Summary: This study focuses on a practical solution to enhance the precision of low-temperature thermometry by driving the probe. The results show that weak near-resonant modulation significantly improves the signal-to-noise ratio of low-temperature measurements while causing minimal back action on the sample. Furthermore, near-resonant driving changes the power law governing thermal sensitivity over a wide range of temperatures, enabling more sensitive low-temperature thermometry.
Article
Materials Science, Multidisciplinary
Zoltan Gyorgy, Andras Palyi, Gabor Szechenyi
Summary: The study investigates a bichromatic EDSR scheme, where two driving tones with different frequencies are used to connect the spin Larmor frequency with the sum of the two drive frequencies. The research suggests that this scheme could be beneficial for a shared-control spin qubit architecture by enabling simultaneous single-qubit gates.
